//package com.example.block_chain.config;
//
//import org.springframework.context.annotation.Configuration;
//
//import javax.servlet.*;
//import javax.servlet.http.HttpServletRequest;
//import javax.servlet.http.HttpServletResponse;
//import java.io.IOException;
//
//@Configuration
//public class CorsConfig implements Filter {
//    @Override
//    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
//        HttpServletResponse response = (HttpServletResponse) res;
//        HttpServletRequest request = (HttpServletRequest) req;
//
//        String origin = request.getHeader("Origin");
//        if(origin!=null) {
//            response.setHeader("Access-Control-Allow-Origin", origin);
//        }
//
//        String headers = request.getHeader("Access-Control-Request-Headers");
//        if(headers!=null) {
//            response.setHeader("Access-Control-Allow-Headers", headers);
//            response.setHeader("Access-Control-Expose-Headers", headers);
//        }
//
//        response.setHeader("Access-Control-Allow-Methods", "*");
//        response.setHeader("Access-Control-Max-Age", "3600");
//        response.setHeader("Access-Control-Allow-Credentials", "true");
//
//        chain.doFilter(request, response);
//    }
//
//    @Override
//    public void init(FilterConfig filterConfig) {
//
//    }
//
//    @Override
//    public void destroy() {
//    }
//}